Door-check



E. TYDE'N.

DOOR GHBGK.-

(No mdelg) Patented Apr. 3, 1888.

N. PCTERS. PLm-mhogmher, wnhingmm at:

iran Srarns PATENT rtree.,

EMIL TYDEN, OF CHICAGO, ILLINOIS.

DOOR-CHECK SPECIFICATIGN forming part of Letters Patent No. 380,367,dated April 3, 1888.

Application filed August B, 18E?.

T @ZZ whom, it may concern:

Be it known that I, EMIL TYDEN, a citizen of the United States, residingat Chicago, in the county of Cook and State of Illinois, have invented acertain new and useful Improvement in DoorGhecks, of which the followingis a full, clear, concise, and exact description, reference being had tothe accompanying drawings, forming a part of this specilication.

My invention relates to door-checks in which a rubber buffer is made tocome in Contact with the door, and thus secure the door in any positiondesired.

It consists of an improved mechanism designed, among other things, toobviate the liability of breaking when the door is suddenly moved and torestore the parts to their inoperative position automatically when thecheck is not in use. Y

In the accompanying drawings, illustrative of my invention, Figure l isa partscctional and broken side elevation of a check fitted to a door,the door being closed. Fig. 2 is a section of the check on the line w zeof Fig. 8, the door being open. Fig. 3 is ascctional view of the cheekon the line c x of Fig. l. Fig. 4L is a sectional view of the check onthe line y y of Fig. 3. Fig. 5 is a front View ofthe door-plate, towhich is pivoted the tumbler for support ing the plunger when in aninoperative posi tion. Fig. 6 is a sectional view ofthe plunger, itscasing, thc tumbler, and the door-plate, taken on the broken linezzofFig. 1. Fig. 7 is a detail View of the roll carried on the lower end ofthe plunger. Its rubber tire is shown in section. Fig. 8 is apart-sectional broken front elevation of a check modified for use on theoutside surface of a door. Fig. 9 is a lougitudinal section of thesaine, taken on the line a u of Fig. S.

Like letters indicate similar parte throughout the several views.

A is a hollow tubular easing inserted in a holein the door, as shown,and having a liange whereby it may be secured within this casing A. Aplunger', B, provided with guiding-surfaces, has a limited perpendicularmotion between corresponding guiding-surfaces in the casing. In thepreferred form, as shown more particularly in Fig. 3, a cross-head, Z),which forms the lower end of the plunger B, works between projectingguidesurfaces a a in the lower end of the casing A, while the upper endof the plunger is produced in the form of a cylindrical shank, b', whichoperates through the aperture a in the casing. A spring, B, is coiledabout the shank b and abuts at one end against the upper internal end ofthe casing and at the other against the crosshead b of the plunger. Thisspring is of considerable stiffness and placed normally so as to forcethe plunger downward.

Between the projecting arms of the crosshead b, at their lowerextremity, is axled the pressure-roll C. As represented in Fig. 7, thisroll is formed with a grooved periphery, in which is firmly cemented atire of ruhber or other resilient material. Projecting from the side ofthe roll and integral therewith is a long thin eccentric cam. Againstthe dat periphery of this cam is pressed the spring D, maintained inconstant pressure against it under considerable tension by being passedunder and seated against the cross-bar bsituate between the cam-lug andthe lug 1)*,which supports and secures the spring D in the crosshead bof the plunger B,tl1is end of the spring being slightly curved over andinto the -cavity in the lug b4 to prevent its slipping from its properposition in the cross-head.

From the plunger B outwardly toward the surface of the door is extendeda horizontal lug, b5. Its action will be more clearly understood byreference to Figs. 5 and 6, in which E is a dat platelet into thesurface of the door. It serves the purpose of supporting and concealinga tumbler, F, pivoted to it by the rivet f. This tumbler is overweightedat one end and maintains normally the position shown in Fig. 5. At theother end a foot-lug projects through a slot in the plate E and affordsmeans by which the tumbler may be operated, and also limits its motionso as to maintain it in an operative position. A projecting lug,

f2, extends inwardly from the weighted end of the tumbler at such apointas to he in the path of the lug b5 of the plunger B, by which it isacted upon in its upward course.

The mode of action of the complete check will now be described.

In Fig. l the plunger is represented in its inoperative position,thedoor being closed and the roll C resting on the door-sill, while thetumbler,shown in seetion,occupies its normal ICO position, with the lugf2 beneath the lug b5 of the plunger. The door is now opened to thedesired distance, the foot is pressed on the lug f', and the tumbler Foperated. releasing the lug b5 from the lug f2, and the plunger descendsand is pressed with a force against the floor sufficient to maintain thedoor in position against any ordinary wind or other eX- ternal force.The foot is removed from the lugf,and the tumbler returns by virtue ofits weighted end to its normal r position. If through inadvertence or inignorance that the check is in use the door be now violently closed,there will be no resultant injury, as would be the case were all partsof a rigid character. The following movements take place: The'resistance of the spring D is vovercome by the eccentric cam in theside of the roll, and the roll rotates as it is forced by the closingofthe door along its path over the tloor, the strength of thespringbeing so proportioned that an ordinary wind-pressure will have no effectupon it; but for a force in excess of this it yields readily, and theaccidents to which it would be liable were it a fixed buffer areavoided. As the door in closing approaches its frame, the roll reachesthe door-sill, and,

mounting its inclined face, forces the plungerv up, compressing stillfurther the spring B, until iinally, when the door is completely closed,the roll rests upon the top of the sill, the lugf2 engages the lug b5,and the check is once more in the position from which itstarted. Vhenthe roll begins mounting the sill, it is easily seen resistance isproduced against the closing ofthe door,since this act necessitates thecompression ofthe spring B. A moderate pressure is thus produced,whichtakes up the shock of closing, and the door finally comes to rest in itsframe Without slam orjar.

In the foregoing I have described the action of the check when the doorhas been closed inadvertently. In fact, however, the action of the'check is identical in closing the door in the ordinary manner, noattention being paid to the check, as in the preceding, the plungerbeing automatically returned Within its casing and there held, asdescribed, by the tumbler. The door may now be opened and shut atpleasure, the check being inoperative until the tumbler is once moreoperated and the plunger released. The rubber tire of the roll Gservesto increase the friction of the roll with the floor their surfaces.

and prevents cutting ofthe carpet as it revolves over it.

Figs. 8 and 9 show a form of casing modified to provide for doors notthick enough to receive the casing previously described Within Thecasing here shown is provided with screwlugs, whereby it may be attachedto the external surface of the door. It

is evident that in this modification no doorplate is necessary, thetumbler being pivoted on the frame itself. In somecases where it isundesirable to have a door-sill or even a camblock by which toautomatically elevate the plunger out of action, it will be necessary toprovide means for elevating the plunger by hand. This is done byextending the shank b of the plunger through the top of the casing andthere arranging a convenient hand-hold, which I have shown in thisconstruction as a lug, b,

I do not limit myself to the exact forms which I have shown anddescribed, but claim and desire to secure by Letters Patent- 1. In adoor-check, the -combination of a roller having a cam on one side with aspring attached to the frame and bearing against the cam, so as topermit of rotation under considerable pressure.

2. In a door-check, the combination ofa plunger with adownwardlypressiug spring thereto attached, a roller j ournaled on theend of said plunger and provided with a cam on one side, and a springsecured to the frame and adapted to bear against said cam to permit ofrot-ation of the roller under pressure.

3. In a doorcheck, the combination of a vertically-reciprocating plungerhaving a side lug with a pivoted Weighted catching Whereby the plungermay be caught and held in an elevated position.

4. In a door-check, the combination of a vertically-reciprocatingplunger with a spring which forces it downward, a lug in the side ofsaid plunger, and a catch-lug on the door, whereby the plunger may belocked in an elevated position.

In witness whereof I hereunto subscribe my Ico name this 23d day ofJuly, A. D. 1887.

EMIL TYDEN.

lwfitnesses:

CHAs. L. BARTLETT, FRANCIS W. PARKER.

